package com.webserver_v2.http;

import javax.activation.MimetypesFileTypeMap;
import javax.smartcardio.ATR;
import java.io.*;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HttpServletResponse {
    private MimetypesFileTypeMap mime = new MimetypesFileTypeMap();

    private Socket socket;
    private int statusCode = 200;
    private String statusReason = "OK";
    private File contentFile;
    private Map<String,String> headers = new HashMap<>();
    public HttpServletResponse(Socket socket){
        this.socket = socket;
    }
    public void response() throws IOException {
        //发送状态行
        sendStatusLine();
        //发送响应头
        sendHeader();
        //发送响应正文
        sendContent();
    }

    private void sendStatusLine() throws IOException {
        println("HTTP/1.1 "+statusCode+" "+statusReason);
    }
    private void sendHeader() throws IOException {
        Set<Map.Entry<String,String>> entrySet = headers.entrySet();
        for (Map.Entry<String ,String> e : entrySet){
            String key = e.getKey();
            String value = e.getValue();
            println(key+": "+value);
        }
        //单独发送回车+换行表达响应头发送完毕
        println("");
    }
    private void sendContent() throws IOException {
        OutputStream out = socket.getOutputStream();
        FileInputStream fis = new FileInputStream(contentFile);
        byte[] data = new byte[10240];
        int len;
        while ((len = fis.read(data))!=-1){
            out.write(data,0,len);
        }
    }
    private void println(String line) throws IOException {
        OutputStream out = socket.getOutputStream();
        out.write(line.getBytes(StandardCharsets.ISO_8859_1));
        out.write(13);//回车
        out.write(10);//换行
    }

    public int getStatusCode() {
        return statusCode;
    }

    public void setStatusCode(int statusCode) {
        this.statusCode = statusCode;
    }

    public String getStatusReason() {
        return statusReason;
    }

    public void setStatusReason(String statusReason) {
        this.statusReason = statusReason;
    }

    public File getContentFile() {
        return contentFile;
    }

    public void setContentFile(File contentFile) {
        this.contentFile = contentFile;
        addHeader("Content-Type", mime.getContentType(contentFile));
        addHeader("Content-Length",contentFile.length()+"");
    }

    /**
     * 添加一个响应头
     * @param name 响应头的名字
     * @param value 响应头的值
     */
    public void addHeader(String name,String value){
        headers.put(name,value);
    }
}
